<!DOCTYPE html>
<html lang="zh">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style type="text/css">
        div{
            color:blue;
        }
    </style>
    <link href="css/css01.css" rel="stylesheet" type="text/css">
</head>
<body>
<div >
    我是div里的内容！
</div>


</body>
</html>